<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> <glsa id="200603-15"> <title>Crypt::CBC: Insecure initialization vector</title> <synopsis> Crypt::CBC uses an insecure initialization vector, potentially resulting in a weaker encryption. </synopsis> <product type="ebuild">crypt-cbc</product> <announced>2006-03-17</announced> <revised count="01">2006-03-17</revised> <bug>126048</bug> <access>remote</access> <affected> <package name="dev-perl/crypt-cbc" auto="yes" arch="*"> <unaffected range="ge">2.17</unaffected> <vulnerable range="lt">2.17</vulnerable> </package> </affected> <background> <p> Crypt::CBC is a Perl module to encrypt data using cipher block chaining (CBC). </p> </background> <description> <p> Lincoln Stein discovered that Crypt::CBC fails to handle 16 bytes long initializiation vectors correctly when running in the RandomIV mode, resulting in a weaker encryption because the second part of every block will always be encrypted with zeros if the blocksize of the cipher is greater than 8 bytes. </p> </description> <impact type="low"> <p> An attacker could exploit weak ciphertext produced by Crypt::CBC to bypass certain security restrictions or to gain access to sensitive data. </p> </impact> <workaround> <p> There is no known workaround at this time. </p> </workaround> <resolution> <p> All Crypt::CBC users should upgrade to the latest available version: </p> <code> # emerge --sync # emerge --ask --oneshot --verbose ">=dev-perl/crypt-cbc-2.17"</code> </resolution> <references> <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0898">CVE-2006-0898</uri> </references> <metadata tag="requester" timestamp="2006-03-14T21:26:26Z"> koon </metadata> <metadata tag="bugReady" timestamp="2006-03-14T21:26:50Z"> koon </metadata> <metadata tag="submitter" timestamp="2006-03-14T23:04:56Z"> DerCorny </metadata> </glsa>